During the complex pathway from bedrock sources to placers, hypergenetically stable minerals (gold, platinum, cassiterite ilmenite, pyrope, diamond, etc.) evolve with noticeable changes in many properties. The main factors are strength selection among individuals of the same mineral species, mechanical activation of the surface of grains during their grinding, removal of impurity elements, partial dissolution and re-deposition of mineral matter.

To predict the enrichment of ores at specific sites of stockevernous deposits for any stage of geological exploration, we propose criteria that can be ranked as follows: the main ones are the content of clay minerals in ores; the content of molybdates; the value and sign of molybdenite thermal EMF; the additional ones are the size and shape of molybdenite individuals, the character of the grain surface; the nature of aggregations with neighboring minerals and the openability of molybdenite.

Weathering and erosion processes destroy the native tin deposit, but the placer collects and concentrates its useful component - cassiterite.

A distinctive feature of many vein tin ore fields is that with a significant total number of ore bodies, sometimes reaching several hundreds, the main reserves of deposits are concentrated in a limited number of the largest ore bodies, which we propose to call ore bodies "leaders" (OBL) ...

Taking into account the influence of geographical and economic factors (differences in climate and relief, in the level of development of industry, agriculture, transportation, energy, in the presence of water and forest resources, in population density and its social structure, etc.) is one of the elements of geological and economic evaluation of deposits at the early stages of study ...

For a systematic and rational study of the mineral resource base of the country, geological exploration is carried out in successive stages. In this sequence, an important place belongs to prospecting and evaluation works, in the process of which the fields are sorted out and the objects for preliminary exploration are determined ...

Tin ores of the Deputatskoye deposit (North-East Yakut ASSR) were formed during five stages: quartz-tourmaline, cassiterite-silicate-quartz, quartz-sulfide, quartz-carbonate-sulfide and carbonate. Cassiterite was isolated from solutions of all stages, but its main mass appeared in the second stage in close association with vein quartz, tourmaline, fluorite, chlorite and wolframite. Cassiterites of the second (main productive) stage were the subject of our study.